Door & Window Chime (2pk)Includes 2 window door alarms, each with 3 adjustable settings: off chime alarm. The loud 120 decibel alarm sounds when door or window opens, helps alert caregivers where loved one is. Easy to install, requires no wiring. Mounting hardware and instructions included. Designed for indoor use only Built in low battery test button to easily check battery life, Includes four LR44 batteries for each alarm.